VST CONNECT with PRO TOOLS Compatibility issues

I don’t get what you want. VST Connect is for a one-way scenario where one party (Studio, Cubase only) is recording and the other (Performer, needs VST Performer application and nothing else) the Artist/Talent to be recorded. The performer does nothing but perform, even audio device setup and mix and everything is remote controlled by the studio (Cubase/VST Connect plugin) just like when recording someone next door.
VST Connect is not a jamming tool, Studio records Performer, that’s it. If you want to collaborate on projects, use VST Transit, built into Cubase and the VST Transit Join plugin allows you to collaborate on the same project even with ProTools. Different product, though.

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